Document compares human body model (HBM) capabilities with anthropomorphic test device (ATD) limitations. HBMs enable assessment at lower impact speeds, evaluation of older occupants with age-dependent material properties, checking belt fit across multiple anthropometries, assessment of restraint system interaction with different body shapes, evaluation of varying postures including non-upright hip angles, consideration of pre-crash phase effects on in-crash phase, and addressing injury types limited by ATD sensor availability and biofidelity. HBMs can be used omnidirectionally if validated, whereas ATDs are limited to design range and single loading direction. Harmonization work is needed for active HBMs, anthropometric agreement, belt fit criteria, and spine curvature validation.